Primes written in primorial base (A049345).

Terms

a(0) =10a(1) =11a(2) =21a(3) =101a(4) =121a(5) =201a(6) =221a(7) =301a(8) =321a(9) =421a(10) =1001a(11) =1101a(12) =1121a(13) =1201a(14) =1221a(15) =1321a(16) =1421a(17) =2001a(18) =2101a(19) =2121a(20) =2201a(21) =2301a(22) =2321a(23) =2421a(24) =3101a(25) =3121a(26) =3201a(27) =3221a(28) =3301a(29) =3321